We observe that the droplets are not static in hydrodynamic environment. Via the calculation of mean-squared-displacements of the centres of mass, we show that these exhibit diffusive motion. Due to sticky collisions among these droplets, the number density of these objects in the system decreases, thereby the characteristic length scale increases. For this diffusive coalescence mechanism we have accurately estimated the exponent for the power-law growth. This in good agreement with a theoretical expectation [1]}, [2]}, [3]}.
